GeForce 9400 GT 256MB vs Radeon HD 6750

Intro

Compare those specifications to the Radeon HD 6750, which uses a 40 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this card. It features 720 SPUs as well as 36 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
Radeon HD 6750		86 Watts
	Difference: 36 Watts (72%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6750 will be 400% quicker than the GeForce 9400 GT 256MB in general, because of its higher bandwidth. (explain)

Radeon HD 6750		64000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 51200 (400%)

Texel Rate

The Radeon HD 6750 should be quite a bit (approximately 493%) better at anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 6750		26100 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 21700 (493%)

Pixel Rate

The Radeon HD 6750 should be quite a bit (approximately 427%) faster with regards to AA than the GeForce 9400 GT 256MB, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6750		11600 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 9400 (427%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.